refactor scene grid code, trying to fix initial alignment

jack/src/jack_client.rs

@@ -18,6 +18,9 @@ pub trait HasJack {
     fn port_by_name (&self, name: &str) -> Option<Port<Unowned>> {
         self.with_client(|client|client.port_by_name(name))
     }
+    fn port_by_id (&self, id: u32) -> Option<Port<Unowned>> {
+        self.with_client(|c|c.port_by_id(id))
+    }
     fn register_port <PS: PortSpec + Default> (&self, name: impl AsRef<str>) -> Usually<Port<PS>> {
         self.with_client(|client|Ok(client.register_port(name.as_ref(), PS::default())?))
     }

jack/src/jack_port.rs

@@ -90,6 +90,9 @@ pub trait JackPortAutoconnect: JackPort + for<'a>JackPortConnect<&'a Port<Unowne
     fn ports (&self, re_name: Option<&str>, re_type: Option<&str>, flags: PortFlags) -> Vec<String> {
         self.with_client(|c|c.ports(re_name, re_type, flags))
     }
+    fn port_by_id (&self, id: u32) -> Option<Port<Unowned>> {
+        self.with_client(|c|c.port_by_id(id))
+    }
     fn port_by_name (&self, name: impl AsRef<str>) -> Option<Port<Unowned>> {
         self.with_client(|c|c.port_by_name(name.as_ref()))
     }